Just to add to the above.
There were 12 on the course, 2 of which were experienced controllers before, 1 area, 1 ex mil. Out of the other 10, 1 was recoursed for medical reasons leaving 11 on the course.
Out of the 9 others with no previous ATC experience 3 passed, along with the 2 experienced guys.
So to summarise. Out of 11 people, 5 passed, two of which being the xeperienced guys.